Page 1
OPERATING
Model
420
INSTRUCTION
440
MANUAL
CTCA
~)
ELECTRONIC
CALCULATOR
Page 2
FEATURES
o Fast, qui
et
printing
up
to
12 digits plus decimal
point,
and
two
symbols;
display 12 digits plus one symbol.
o
Independent,
addressable 6 key
memory
o
Automatic
constants
in all four functions
o
Percent
add
on/discount
(separate register)
o
Pun
ctuation
(separation
of
numbers)
o Add-mode
with
over-ride
o One
touch
grand
total
operation
o Bright easy
to
read display
o Double Item
Counter,
counts
up
to
999
entries
o N
on
Print
o Roll-over
keyboard
with 8 digit Buffer Register
o Paper release
Page 3
CONTENTS
FEATURE
S.
I
KEyBOARD
..
. . .....
.. ........ ........
.. ......
. .
... ... ...
. . . . .
3
SPECIFICATIONS
. . .
.. . .............
.
...........
..
....
..
. .
...
. .
4
E
XPLANATION . ..
....
.. .....
. .
.. ...
. .
.. ...
...
. . .
..
. .
.....
...
. .
5
RIBBON
CHANG
E . ....
.....
.
.. .. ...
. .
...........
.
....... ...
...
.
7
PAPER
CHANG
E ..
.. .........
. .
....
.......
.
.......
.
..... ....
..
.
8
OPERATING
EXAMPLES ... .
.......
.
....
..
. .
.. ... ...
. . . . . ......
.
9
6) Percentage
Calculation.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
'2
7) Memory
Calculation.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ' 3
I) Addition and Subtrac tion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
9
2)
Multiplication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
J) Divisio
n.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
II
4)
Mix
ed
Calculations
.....
.
......
..
. . ....
.. ..
. .
....... .......
II
S)
Accumulation Calc
ulation
....
. . .
................
. .
.......
...
12
8) Invo
ic
e Application . .
......
. . . . . .........
. . ........
..
. . . ... 14
9)
Cro
ss Footing Applicatio
n.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..
15
10)
Percentage Distribution Applicati on
..
...
..
..... . ..
. . . .
..
..
. .
..
16
11 ) Percentage
of
Increase or
Decr
ease Applicati on . . .
... . .. . .. . ..
..
. 16
12) Payroll Application .....
. . : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2
Page 4
1
};~~
~
t==
~
,
f6\
L-
____________
29
l
D------------------~
1a
-------------------
L------------
- (
30l
1. Paper Release
2. R
ound Off Select or
3. Dec imal Sele
ctor
4. Memory Light
5. Negati
ve
Indica
tor
6. Overflow Indica
tor
7. Feed Key
8.
Item
Counter Key
(420 only)
Gra nd Total
Ke
y
(440
only)
9. Clear A
ll
Key
10.
Cl
ear Key
11.
Clear E
ntry
Key
12. Numeral Keys
13. Decimal Key
14. Addition K
ey
15
. S
ubtraction Key
16.
Total Key
17. Non Add/Sub-Total
Key
18.
Me
mory Minus Key
19. Non Print Key
20.
Pe
rcentage Key
21. Print Key
22.
Me
mory
Total Key
23. M
emory
Sub-Total
Key
24.
Me
mory
Min
us
Equal
Key
25.
Me
mory Plus Equal
K
ey
26. Equal Plus Key
27. Division Key
28. Multiplication Key
29. Equal Key
30.
Me
mory Plus Key
3
Page 5
SPECIFICATIONS
1.
CAPACITY:
Entry
.. .. ..
. . . . . . . . . . . . . . . . . . . . . . . .
....
. . .
12
digits
Addition
and
Subtraction
......
. . . .
.. ..
.....
.....
. . .......
. .
12 digits
M
ul
tiplicati on :
Multip
li
er
...
.. . ..
. .
... . .. ..
. .
...
. .
..
. . .
.....
..
.. . ...
.
12
digits
M
ul
tipl i
can
d.
. . . . . . . . . . . . . . . . . . . . . . . .
..
. .
...
. .
12
digits
Pr
oduct .......
.
..
. . .
..
... . ..
..
.. . ...
..
. . . . . .
..
. .
..
. . .
12
digits
Division:
Div
is
or
......
.
..
. . . .
...
. .
12
digits
Divid
en
d . . . .
... . ..
. . . .
12
digits
Qu
otie
nt .
.... . .. . ..
......
..
. .
12
digits
Ac
cum
ul
ator
..
.. . ...
. 12 digits
Max
imum Dec
imals.
12
digits
2.
PRINTING:
Nu
mber
of
print character
s:
(
12
numer
als. 1
decimal
point
and
2 symhols)
Spe
ed: 2.5 lines per second
Pap
er:
Standard roll
pape r
Wi
dt h ... . ... . ..
...
..
. . .
..
.... . .. . ..
.
2 l/4"
Diameter . ...
. . .
......
.
.. . .. ..
...
. .
.....
....
. . . . . .
2 .l!4"
Ribb
on:
2·color (Black
and Redl
W
idth
.. . ..
. . . . . . . .
.....
..
. .
....
.. . ....
. . . . . · . . . .
1 / 2"
Le ngth
.. . ..
. . .
.. . ..
. . . .
210"
Ribb
on Spo
ol
.........
...
.......
.....
. . ... .
......
.
Standa
rd TY
re
3.
COMPONENTS:
LSI
4.
VOLTAGE :
AC I
17V SO/60
HZ
S.
POWER CONSUMPTION:
J8W
6.
SERVICE TEMPERATURE:
32
.0
F·
104
.0oF
7.
DIMENSIONS:
9-1/8
"(W)X 14.0·'(L IX 3-1/ 8(H)
8.
WE
IGHT :
7
Ibs.
4
Page 6
KEY
EXPLANATION
1.
DECIMAL
SELECTOR
Settings F,
A,
0, 1,
2,
3, 4, 6
F,
Floating
Decimal.
will
calculate
all
decimals
in
the
answer.
A,
Add Mode,
setting
used for
addition
and
subtraction.
0,
1,2,3,4,6
setting
determines
the
number
of
decimals
in
the
answer
only.
2. ROUND
OFF SELECTOR
.r
5/
4.t
.r
Truncate
or drop orr, 5/4 Round
orr
5 or m
ore
, t
Round
Up 1 or
more.
3.IFEEDI
Adva n
ces
paper.
4.
[!9
ITEM
COUNTE
R (420 only)
Recalls
numher
in
the
item
counter
register
(add
register
and
= + registerl.
5.
B NON-PRI
NT
(Latch Down)
Turns off
print
mechanism
.
6.0
PRINT
KEY
Prints only
the
last
number
when
depressed
.
7.
~
Clears entire machine.
8.
~
CLEAR
KEY
Clears X and
-;-
func
tion
only.
9.
~
CLEAR
ENTRY
Clears
keyboard
entry
not
function X or
-;-
.
10.
°
...
9
numeral
keys .
11.
0
DECIMAL
POI
NT
KEY
Enters
decimal
point.
12
. G
ADDITION
KEY
13. B
MINUS
KEY
14.8
TOTAL
KEY
Totals res
ult
of
addition
and
subtraction.
5
Page 7
15
.
p/#I
This key has dual function, when depressed immediately after
number
is
in·
dexed acts as non-add , when depressed after
+
or
- acts as subtotal.
16.
~
MULTIPLICATION
KEY
Sets
lip
multiplication
and
holds
multiplier
as c
onstant.
17 .
BDIVISION
KEY
Sets
up
division
and
holds
divisor as
constant.
18.
G Calculates result
of
multiplication and division.
19.
~
PERCENT
AGE
KEY (See examples)
20.
B EQUAL PLUS
Calculate
s results
of
multiplicat ion and division
and
automatically
accumulates
result in
add
register.
2
1.
0
MEMORY
PLUS EQUALS
Automatically
ca
lc ulates results of multiplication and division
and
adds
results
in
memory .
22
.
[0
MEMORY
MINUS EQUALS
Automatically calculates results of multiplication and division and sub
tr
acts
results from memory.
23.IMol
MEMORY
SUBTOTAL
24. [ill
MEMORY
TOTAL
25.
~
MEMORY
PLUS
Adds directly
to
memory
.
26.0
MEMORY
MINUS
Subtracts directlv from mem()rv
27.
IQ]
Prints
contents
of
Grand
Tot
al Registe r,
Item Cou
nter
of
GT
Register,
Item
Counter of
GT
Register
and
clears (4
40
on
ly).
28
. M ·
UGHT
IN
DISPLAY PANEL
29.-+-
OVERFLOW
LIGHT
IN
DISPLAY PANEL
30. -NEGATIVE
LIGHT
IN
DISPLAY
PANEL
Page 8
RIBBON
CHANGE
1.
Inked Ribbo
n should be
good
qua
lity
and
high density in
ked
ribb
on.
2.
Inked
Ribbon
sho
uld
be
set
as
show
n in fig
ures
one (
I)
and
(2).
Spo
ols
sho
uld
latch
in place.
3.
If
Ribbon is loose.
turn
spo
ol until ribb o n
is
taut.
RIBBON
FRAME
FIG.
(1)
FIG.
(2)
7
Page 9
PAPER
CHANGE
l.
Before
loading
paper
roll, be
cer
tain
the
end th at is
to
be insert
ed into
the
machine
is
not
torn
or irre gula
r.
2. Mo unt P
aper
roll on Paper
Holder
. Insert pape r int o the sl
ot
and depress IFEEDI
Key until
paper
extends
be yond
tear off
blade.
CORRECT
IN
CORRECT
Page 10
OPERATING
EXAMPLES
Addition and Subtraction
Prohlem Switches Entry
Depress Tape Display
12
.1
+
4~(,
+
7RY
De
cimal
A.
0,
/ 4
[C
][I]
QJ
G
1 23 +
123
0w
GJ
G
40,6 +
0,.79
00[TI
G
7~q
+
tJ.oB
~
II.
h8 T
tJ. hk
R
epea
l additi on
an d suhtrac
ti
ll
ll
A .
0,/4
[IJ00
G
1.23
+
1.2.\
GJ
1.23 +
2. ·H,
G
1.
23
+
.1.69
G
1
.23
- Irc:dJ
2.-10
8
2.4
{,
T
2.
-16
I n +
-IS6
- 7tN
A .
5/
4
[i]w0
G
123 +
1.23
ElITJ
G 0
4SI
) +
~.7q
[2J[IJGJ
G
7
.fN
- I rc:d) - 2
.1
0
G
-::. l OT
I rc:d I
-
llO
9
Page 11
Multiplication
Prol>lem Switch
es
Entry
De
press
Ta
pe Display
12 X
L\
2.
;:,
4
DJITJ
0]0
0
El
12
X
u.
1 :,n.OO.
J 2.
J:'h.O()
Chain J11uhiplicalinn
2
X.\
X 4
2.
5 '4
0
W
GJ
0
0
0
2.
X
J
X
.:\
24,()(
)*
],
6
24, {)()
Cnnstan l
Jllullipli
c lI i(ln
12 X 2
2.
5
/
4
[D[IJ
W
0
0
12
X
2
=:
2-l.()O.
12
2UX)
12
X 3
[TI
0
.'l
=:
.16'c)()
*
.\
.'\6(
~)
12 X
-l
0
EJ
-l
=:
4R
C)()·
.:j
4K()()
12 X
;:,
.
[8
B
~
~
hO.OO·
~
60.m
10
Page 12
Division
Problem Switcbes Entry
Tape Display
Depress
144
-;-
12
1
44
-;-
2.
:'>/
4 1
44
GJ00
B
COo]
12
~
12.00-
0
12.00
Chain
div
ision
1
23
-;-5 -;-
()
1
23
-;-
[JJITJIT]
2.
5/4 1
23.
B
B
5
.;-
IT]
2·U
[IJ
()
~
El
~. I()
4.
10 -
Constant
divisi
on
2.
5/4
1
45
-;-
12
145
-;-
I
~:;
QJ8JQJ
El
1
59
-;-
12
eDIT]
12
=:
144
-;-
12
~
1
2.0~
12.01-1
-
QJ
[I]
QD
1
59
=:
Ll.25 -
G
1.'
\2:)
144
'=:
G
ITJ0
GJ
12
.00
12
.00 -
Mixed Calculation
Problem Switches Entry Depress
Tape Dis
pla
y
(1
23 -23)
-;-
4 X 5
2.
5/ 4
QJ
0 0
0 0
G
m
G
6
8
G
G
~
123.00 +
D.OO
-
(red)
100.00 T
100.00
-;-
4 X
5
'=:
125.00·
123.00
100.00
100.00
100.00
25
.00
125.00
125.00
11
Page 13
Accumulation
Calculation
Tape Display
Depress
Problem Swilches Enlry
0
12 X
12
12 X
12
[TI
m
A. 5/4
OJ
[I]
J2
=:
10 x 10
B
14
4,()()
+
14
4,00
[Q[QJ
10
1,2,
::;
+ 10 X
0
10
=:
B
OJOD
I
()()
()()
l
o(),n
o +
G
1,25 +
24.i 25
QJ
mGJ
24,i 25
24:'>
,2:' T
GJ
Percentage
Calculalion
Prohlem
100 X 10"\,
250
-;-
25°
{,
Percent. Add on
an
d Disco
un
t
12
5.
l
ess
"
'Yo
Discount plu
s'
6%
Tax
Switches
2. 514
2.
5/
4
2.
5/4
Tape
Display
Depress
Entry
OJ
QiJl2U
OJ@]
ITl ITl
GJ
WG]
OJ
[I]
[8
G
W
I
100
J(X
l X
0
[7J
I
()
'x.
I(),
m·
I°,(X)
2~
()
-;-
2:'0
B
I
O()()
, 00
[Z]
I 000
,00
*
0
125
12~
X
~
5
·~·
l
h,2
5
(,,2~
*
G
I I
R.75
11
11.75
- %
0
I P
U5
X
5J
7.
LI
("
%
7,
IJ.
EJ
1
25,RR
125
,1\H
+ %
12
I
Page 14
Memory Calculation
Problem Switches
Entry
Depress Tape
Display
o X 5
4 X 8
2. 5/ 4
~
IT]
0
~
o X
5
~
0
5
7X9
---
To
tal·
J
GJ
[]J
0
0
JO.oo
+ M
4X
8~
M 3
0.00
4
8
[I]
[I]
0
0
32.oo+M
7X
9 ;"
32.
00
7
9
03 .
oo+M
63.00
~
12S()()
·M
125.00
Memo
ry Calc .
with
Conswnt
12 X 1.
25
12 X 4.25
2. 5/ 4
00
ITJ
DITJITJ
0
~
12 X
1.25;"
12
12
X 7YS
00
[}]
[I]
~
IS.
OO+
M
4.25
~
I
\(X)
51.()()+ M
:;
100
[2JD~ITl
~
7.
YS
~
0
l)S.40+M
IhlAO*M
Y:;.40
101.40
Additi
on
and
Suhtra
c tion
into Memory
12
.\
- 4:,h +
'7HY
A.
5/4
[][TI0
~[I][IJ
C2JITJw
0
~
0
fill
l.2
3 + M
4.56-
M (red)
7.
89+M
4.50
1.2:\
4.50
7.89
4.56
13
Page 15
Invoicing
Problem
Switches
Entry
Depress
Tape
Display
12
Items @
1.2
5
24
Items @ 2.98
A.
5/
4
OJ
[I]
OJ
00[}]
0
0
12
X
1.2
5
~
12
1.2
5
5 Items
@
1.59
Total
Di
scount 2%
mIT]
GJO[2J[I]
0
~
15.
00
+M
24
X
2.9R
~
1 .00
24
2.9R
Ta
x 5%
Total
IT]
[IJO[IJeTI
0
~
7
1.5
2+
N1
5X
1.59
=:
7
1.
52
5
1.
59
m
B
0
[8
, 0
7.95+ M
94.47-M
9
4.47
X
2
O,{
l
7.95
9447
94.47
2
IT]
EJ
0
5J
1.89-
92 .58
- %
92.511
X
5
~~
l
1.8
9
92.58
92.511
5
G
4.
63
-
97.2 1 + %
4.6:1-
97
.21
14
Page 16
Cross Footing
Example:
1.23
4.56
7.
89
1.4
7
2.
58
3.69
13
.68 7.
74
Grand
Total
21.42
Switches
EDtry
Depress
Tape Display
Decimal
A.
5/4
[HI]
[]
1.
23
+ 1.23
GJ
4.56
+ 5.79
mITlru
G
[fJ
ITJ0[1J
7.
89 +
13.68
8
13.68 T
13.68
[B
QJmITJ
1.4
7 + 1.47
[±]
ITJITl[]J
4.05
2.58
+
G
7.74
3.68
+
0mCIl
8
7.74
T
7.74
21.42
G
21.42
~
15
Page 17
Percentage Distribution
What Pe
rce
nt is each
num
ber
of the T otal
')
Exam ple :
Amo
unt Pe
rcent
age
12
3.
00
.
09
%
456.00 .33%
7119
.00
.5
8%
13611.
00
1.
00%
Switcbes
Entry
Depress
Tape
Display
De
cima
l
2.
5/4
OJ
ITJ
DJ
G
[B
00ITJ
GJ
[i][IJ[I]
0
~
B
[D[I]0
~
[i]mIT]
~
G
1
2J.~
1
2.1
12
3.00 +
1
2.1.00
45<'
.00 +
579
.00
7k
Y.()0
+
1J6R.OO
I
:1
08.00 T
Ll61\ .00
136R
=:
J:l6
R.00
O
.Ol)
+
0
.0
9
456
=:
456
O
..
"l:l
+
0.33
789
=:
711
9
0.58 +
0.511
1.
00 T
1.00
Percent of Increase or Decrease
Example: Sales
1974
Sales
197
5
Increase
Per
ce
nt
In
crease
789,654.00
987.456.00
19
7,802.
00
25 .05
Switches Entry
Depress Tape
Display
Decimal
2, 5/ 4
[I]
[I]
[2J[TIww
[2J[I][TIw[I]0
B
0
B
B
987456.00 +
789654
.()()
+M
789
654
.00
::::
"
197802.00
.;-
987456.00
789654.(
)()
19
7802.00
197802.00
~
7896S4.00
·M
78
96
54.00
~
789654.
%
8
25.05-
197802.00 T
25.05
19
7802.00
16
Page 18
Payroll
Example:
Rate per hour
Overtime
Hours (Reg.)
Hou
rs
(O.T.)
Soc
ial
Sec urity
State Tax
In
co me Tax
Hospitalization
4.
52
1.1
12
40
8.3/4
.0
585
(factor)
.02
5 (factor)
(Se
e Inco
me
Tax Chart)
6.
50
Swilches
Decimal
A. 5/ 4
Entry
EJ
D
[TI
[I]
I Kat
e)
o
~
(H
rs Reg
.)
Depress
0
~
Tape
4.
52 +
-+
0
~
Displa~
-+.52
IT]
D
IT]
iO.T. Rate )
B
I
Ku.H
O+M
1 5
~
I
HO.H()
{, . 7~
III D [I]
[JJ
(OT.
Hrs l
0
0
h.
7R*
6.
78 X
H.
75
~
6.71'
h.
7h
59.JJ
+M
S
<).
3J
D
OD
IT]
[I]
IT]
(5. 5.1
~
0
EJ
240. IJOM
240
.1
3 X
0.0585
=:
240
.1
3
240.1J
o
[QJ
OJ
IT]
(State Tax)
EJ
14
.05
+
0.025
~
14.
05
6.00 +
6.CXl
~~D~][
Il
(Income T
ax
Chart )
m
Om[I]
(Hospitalization )
G
0
8
~
~
48.03 +
6.
50
+
74.58T
74.58-M
(red)
1
65
.5S*M
61\08
74.51\
7
4.
58
74 .58
165.55
I7
Page 19
CORPORATE
OFFIC
ES
TCAINCORPOR
ATED
1701
SOUTH
PENN
SYLVANIA
AVENUE
MORRISVILL
E, P
ENNSYLVANIA
19067
C_T
_C_A
___
)
SERVICE CENTER LOCATIONS
You may
cont
act any of these Service Centers
to
obtain the location of the nearest author-
iz
ed TCA dealer.
NEW
JERSEY
65
W.
Sheffield Avenue
Englewoo
d,
New Jersey 07631
(201) 567-4990
GEORGIA
3955 Pleasantdale Road
Su i
te
#108
Atlanta,
Geo
rgia 30340
(404 ) 449-6 390
ILLINOIS
2510 Dempster
Suite
#10
6
Des Plaines, Illinois 60018
(312) 298-4260
TEXAS
6350
LBJ Freeway
Registry, Suite #137
Dallas, Tex
as
75240
(2
14) 233-7215
CALIFORNIA
3605
W.
MacArt
hur
Boulevard
Suite
#708-709
Santa An
a,
California 92704
(714) 549-8172
PENNSYLVANIA
1701 So . Pennsylvania Avenue
Morrisville, Pennsylvania 19067
(
21
5) 736-0047
Page 20
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IN ,JAPAN
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